Throttle-valve for drills



1,370,061. c.. Patenmm.1,1921..

Q 2 SHEETS- snuff- W. A. SMITH.

' lTHRQTTLE VALVE Fon DRILL-s. APPLICATION FILED MAILI23| I9I8 UNITEDSTATS-Es PAENT clarion.

WILLIAM A. SMITH, OP EASTON, PENNSYLVANIA, AssIGNOR To NeEEsoLL-RANDCOMPANY, OE JERSEY CITY, NEW JERSEY, A CORPORATION OP NEW JERSEY-lTHRoTTLE-vALvi-i POR DRrLLs.

Specification of Letters Patent.

`Patented Mar. 1, 1921.

Application filed March 23, 1918.l Serial No. 224,333.

T0 all who/m, t may concern y Be it known that I, VILLIAM A. SMITH, acitizen of `the United States, residing at Easton, in the county ofNorthampton and 'State of Pennsylvania, have invented a certain new anduseful Improvement in Throttlc-Valves for Drills, of' which thefollowing is a specification.

This invention relates to percussive tools, and in particular to athrottle valve for self rotating hammer drills.

In many forms of percussive or hammer drills a motor is provided which,being supplied with'motive .fluid of the same kind as supplied to thepercussive element, produces rotation of the drill or other miningimplement. This necessitates a throttle valve to vary and control thesupply ofmotive fluid to the percussive and rotating elements of thedrill, which elements take varying proportions offluid, depending uponthe class of rock being drille l The objects, therefore, ofthe presentinvention are to provide a throttle valve for hammer drills or otherrotating rock drills which will control the supply of fluid to thedrilling and rotating mechanism; that will permit the regulation offluid to the rotating mechanism while the drill is in Operation, and.will cut OH the supplyl of fluid to the rotating mechanism when thedrill is stopped. Another object is to permit the valve forl varying thesupply of fluid to the throttle valve and to be moved bodily thereby sothat when the throttle valve is opened the valve for supplying therotating mechanism will not require readjustment but will be broughtback to the same place relatively to its port to which it was previouslyadjusted.

With these and other objects in view, my invention consists in thefeatures of construction set forth in the following specification andillustrated inthe accompanying drawings. y Y A In the drawings annexedhereto and forming a part hereof:

Figure 1 showsa longitudinal view of the drill with the throttle valveshown in section;

Fig. 2, a longitudinal view of the complete tool in section;

Fig. 3, a view in cross section of the rotating motor;

Fig. 4, a cross section through the throttle valve taken on the line 4 4of Fig. v1;

Fig. 5, a view similarfto Fig. 4, taken on the line 5--5 of Fig. l.Referring more. particularly to the drawings, 1 Shows the cylinderof ahammer drill having a throttle valve 2 made in accordance withthepresent invention. At 8 is shown the piston adapted lto reciprocatewithin the cylinder l, being supplied with motive fluid through passages4 to the various pressure areas of the piston 3. The drill rotatingv'mechanism 5 comprises a geared motor which is supplied with motivevfluid through the passage 6. It is the function of the throttle valve 2to control the supply of fluid through the passages 4 and 6 in a mannerpresently to be described to vary the power and 'speed of theA rotatingmotor. Y f f Thethrottle valve 2 comprises a 'casing which ispreferablyrmade integral with the cylinder l( This is bored to a taperfrom one end to the other, as is usual, and fitting this bored sectionis a hollow sleeve 7 rotation of'which opens and closes passages to theports of the drill. For this purpose the sleeve is provided with twoports 8 and` 9 vextending throughy the lateral face ofl the sleeve, asclearly shown in Fig. 1. The port 8 opens and closes communication withthe passages 4 controlling the operation of the piston 3 while the port9 vopens and closes the passage 6 admitting fluid to the rotating motor5.l It is obviousthat the speed` and power of the rotating motor 5 mustbe regulated for the different types and hardness of rocks in which thehammer drill is,being used. This is accomplished by means of anindependently operated valve placed within the throttle valve 2 as shownat lO. Within the hollowed section of the sleeve 7 is placed the valve10 having a portion tightly fitting the inside of the sleeve 7 about theport 9 so that rotation of the valve 10` relatively to the sleeve l''will open and close the i port '9. This portion of the valve 10 isprovided with flattened portions 11 permitting the passage of fluid pastthis portion of the valve and permitting it to enter the port 8, oneedge covering or uncovering the both ports, namely, 8 and 9. However,the auxiliary valve 10 Within the sleeve 7 may be independently operatedby means of its that is, closes or opens commuication With Y passages 4and 6, so that When the drill is shut downboth the piston 3 and rotatingmotor 5 are stopped. lVhen the drill is started, ,movement of the handle12 to open the passage l to fluid pressure also opens the passage 6, andthis movement of valve 2 by means of handle 12 does not affect theposition of valve 10 in relation to port 9,V

sol that unless the handle 13 is moved relative to handle 12 the speedof the rotating motor 5 is not affected and does not have to be adjustedeach time the Vdrill is started.

The passage 6 at the point Where it joins the throttle valve 2 isenlarged, at 16, so that the port 9 opens into this enlargement 16 ofthe passage 6 before the port 8 opens.

This enables the rotating motor 5 to be started and brought up to speedbefore the piston 3 is'started. A movement of about forty five degreesof the handle 12 opens port 9 into passage 6 and a further movement ofabout forty live degrees of this 'handle opens the port S and passageLl, the

passage 6 being still kept open. This is clearly shown in Figs. 4: and5.

At one end of the throttle 'valve 2 is the plug 14 and nipple 15, as isusual in this type of valve, through which fluid is'supplied from anoutside source to the space Within the sleeve 7.

In operation, the handle 12 is first moved to its open position, afterwhich the handle 13 is adjusted relatively to handle 12 so that therotating motor 5 is regulated to the speed desired. In shutting off thedrill the handle 12 is simplvmoved back to its closed position, whichcloses both ports 8 and 9. To start up the drill it is simply necessaryto move handle 12 to its open position, which will also open port 9 tothe position to which it had previously been adjusted. y

It is to be understood that Whilethe presentV showing and descriptiondisclose only one specific embodiment of the v present invention, otherVforms and modifications are included Within the spirit and scope of theinvention, asfexpressed in theY` appended claim.

lVhat I claim is:

In a fluid operated lpercussive tool, the combination of a reciprocatingmotor, a rotation motor, and a throttle valve comprising a casing havinga tapered bore provided Withan inlet at the larger end and lateralsupply passages lleading to the said motors respectively, a hollow'sleeve rota'- table in said bore andlhaving 'admission portscontrolling said supply passages, a handle for operating said sleeve, anindependently operated auxiliary valve Within the said sleeve andmovable therevvith'having a stem, and a plug provided with flattenedsides, said plug controlling the admission port in the sleeve leading tothe rotation motor but permitting the passage of motive fluid from thesaid inlet in the casing past the plug and through the sleeve to theports leading to the reciprocating motor anda separate handleforgoperating said independent auxiliary valve.

In testimony whereof, I have hereunto set my hand.

WILLIAM a. SMITH.

